UK parents, listen up: you’re letting your babies down. So warn husband-and-wife team Brian Jackson, director of the Child Minding Research and Development Unit, and child psychologist Sonia Jackson, writing in the Observer Magazine on 22 September 1974. They kick off a three-part series on child development with a stern rebuke: we are failing our little nippers in the ‘vital’ preschool years, a time ‘when so much of a child’s intellectual development is won or lost’.